Shadow Dance in Solo PvE

I have been recently experimenting with the Sub spec and am having a lot of fun with the burst it brings for solo play out in the world.
(I have not done any raiding in this spec and don't think I will anytime soon.)

But the basic question I have is this; Does Shadow Dance have any usefulness when fighting anything solo?

I get that it allows you to use Ambush while not in stealth, but the positional requirement of Ambush still applies, so unless a tank has aggro on your target you can't get behind your target to use the Ambush.

What am I missing here? Are there good uses of Shadow Dance in solo play that I'm not thinking of? Or am I just thinking of it incorrectly?

It just seems like a waste of a level 80 talent. The other specs have Vendetta and Killing Spree which can obviously be used in any situation.